fix: don't swallow createAsyncThunk aborts that happen before pending

[chatman-media]

Summary

If a thunk's AbortController is aborted before the pending action is dispatched, the abort is silently swallowed and the error is mislabeled as a ConditionError.

This happens in two cases:

1. An already-aborted external signal is passed to the thunk action creator.
2. abort() is called during an async condition (before it resolves).

In both cases the thunk currently throws:

{ name: 'ConditionError', message: 'Aborted due to condition callback returning false.' }

Because the error is named ConditionError, the resulting rejected action has meta.condition === true, so it is skipped by default (unless dispatchConditionRejection: true is set). The net effect:

• No action is dispatched at all — the abort is silently swallowed.
• The error is reported as a condition rejection, even though no condition callback ever returned false.

This is inconsistent with aborting the same signal a moment later, once the thunk is already running. That path correctly produces a rejected action with an AbortError and meta.aborted === true, and matches the documented “Canceling While Running” behavior:

After a thunk has been cancelled this way, it will dispatch (and return) a "thunkName/rejected" action with an AbortError on the error property.

Reproduction

const thunk = createAsyncThunk('test', async () => 42, {
  condition: () => true, // any options object triggers the skip
})

const signal = AbortSignal.abort()
const dispatch = vi.fn()
const result = await thunk(undefined, { signal })(dispatch, () => ({}), undefined)

// Before this PR:
//   dispatch was never called (abort swallowed)
//   result.error.name === 'ConditionError'
//   result.meta.condition === true

The fix

The condition check in createAsyncThunk previously collapsed two distinct cases into one:

if (conditionResult === false || abortController.signal.aborted) {
  throw { name: 'ConditionError', message: 'Aborted due to condition callback returning false.' }
}

It now distinguishes them:

• condition returning false → ConditionError (unchanged — still skipped by default).
• Controller aborted → AbortError carrying the real abort reason, so the rejected action is dispatched and the error is labeled correctly, consistent with aborting after pending.

Tests

• Added a regression test asserting an already-aborted external signal (with options present) dispatches a rejected action with an AbortError instead of being swallowed. This test fails on master (expected 'ConditionError' to be 'AbortError') and passes with the fix.
• Updated two existing tests that previously asserted the swallowed/mislabeled behavior:
  • aborting during an async condition… (was async condition with AbortController signal first) now asserts a rejected action with an AbortError.
  • handles already aborted external signal now asserts 'External signal was aborted' (matching the sibling accepts external signal test) instead of the ConditionError message.

Full packages/toolkit test suite passes (60 files, 1055 tests).

Related to #3826 (the broader family of swallowed errors from condition/forceRefetch); this addresses the abort facet specifically. The genuine condition === false skip behavior is unchanged.

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